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Old debate re-opened - What is a planet?

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20 years 1 month ago #2387 by dave_lillis
Replied by dave_lillis on topic Re: Old debate re-opened - What is a planet?
Ok, this is the way I see it.
Planet = body with a diameter greater then 1000km/miles which orbits a star/s, implying that it orbits nothing else.
2 exceptions

1, double/multiple planet, where both/all bodies have a diameter greater then 1000km AND their center of gravity is located outside of either mass, (they obviously orbit each other and that pair/set orbit the star).

2, rogue planet, where a body greater then 1000km is wondering in intersteller/intergalactic space with no associate star, (presuming it is not a star itself).

Shape/brightness/observability/direction or composition do not come into it.

Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)

Carrying around my 20" obsession is going to kill me,
but what a way to go. :)
+ 12"LX200, MK67, Meade2045, 4"refractor

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20 years 1 month ago #2389 by John OBrien
Replied by John OBrien on topic Re: Old debate re-opened - What is a planet?
Some quotes from Dr. Alan Stern leader of the new horizons mission to Pluto...

On size:

"You wouldn't deny a chihauhau a place among dogs because it is too small"

On having too many planets:

"if your brain was so completely full of names of people that it just couldn't take any more, would anyone new who you met after that, therefore not be a person?"

"We are the music makers ... and we are the dreamers of dreams." - W.W.

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20 years 1 month ago #2391 by stepryan
Replied by stepryan on topic Re: Old debate re-opened - What is a planet?
seeing that the word planet was derived from the old greek word meaning wanderer, i contend everything in the universe that moves through the heavens is a planet ;).
stephen.

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20 years 1 month ago #2397 by dave_lillis
Replied by dave_lillis on topic Re: Old debate re-opened - What is a planet?

Some quotes from Dr. Alan Stern leader of the new horizons mission to Pluto...

On size:

"You wouldn't deny a chihauhau a place among dogs because it is too small"

On having too many planets:

"if your brain was so completely full of names of people that it just couldn't take any more, would anyone new who you met after that, therefore not be a person?"


Would you call a girl a woman or a boy a man ???? :lol:

Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)

Carrying around my 20" obsession is going to kill me,
but what a way to go. :)
+ 12"LX200, MK67, Meade2045, 4"refractor

Please Log in or Create an account to join the conversation.

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